checks types in u3_http_ef_that, calculates length for host snprintf
checks types in u3_http_ef_that, calculates length for host snprintf

ngzax/urbit,jfranklin9000/urbit,ngzax/urbit,urbit/urbit,ngzax/urbit,jfranklin9000/urbit,ngzax/urbit,jfranklin9000/urbit,ngzax/urbit,jfranklin9000/urbit,urbit/urbit,jfranklin9000/urbit,urbit/urbit,jfranklin9000/urbit,urbit/urbit,urbit/urbit,ngzax/urbit,jfranklin9000/urbit,urbit/urbit,ngzax/urbit,urbit/urbit